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      // 保留小数位数，四舍五入
      // num.toFixed()
      const num = 10.923;
      console.log(num.toFixed(1));
      const num1 = 10;
      console.log(num1.toFixed(2));

      // 传参数，也会四舍五入， 注意 返回值是字符串！！！！

      // 如果不传参数,四舍五入转为整数
      console.log(num.toFixed());
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